The devil is in the detail, pun intended.
I am not aware of any other tweeter reaching beyond 150 kHz or even close to that. That is different from me thinking they are the best. If I would think so, I would have Lansches. Well, I do not.
Have heard both, Lansches and Accapellas. Their challenges do however not lie in the tweeter IMHO.
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I've heard Lansche speakers a few times. There is a reason hardly anyone discusses them. As for Accapella, I've heard them a few times. IMO Avantgarde's have it all over them....especially now with the XD series.
But I will say this, the Lansche has an interesting tweeter. It doesn't sound particularly good to my ears, but it is interesting and different and that's not always a bad thing.
Best conventional tweeter I've ever heard is the Revel Studio2/Salon2. It's perfection. Period.
Best ribbon tweeter I've heard belongs to Raidho.
But like you said, there is a lot more to a speaker than just its tweeter.